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Shimoyama, Iwao; Hirao, Norie; Baba, Yuji; Izumi, Toshinori; Okamoto, Yoshihiro; Yaita, Tsuyoshi; Suzuki, Shinichi
Clay Science, 18(3), p.71 - 77, 2014/09
no abstracts in English
Mo sublimated from neutron-irradiated UO
; *
Int.J.Appl.Radiat.Isot., 32, p.353 - 354, 1981/00
no abstracts in English
Nihon Genshiryoku Gakkai-Shi, 10(2), p.54 - 57, 1968/00
no abstracts in English
Shimoyama, Iwao; Honda, Mitsunori; Kogure, Toshihiro*; Baba, Yuji; Hirao, Norie; Okamoto, Yoshihiro; Yaita, Tsuyoshi; Suzuki, Shinichi
no journal, ,
We have proposed a low-pressure sublimation method for Cs removal from radioactive-contaminated soil in Fukushima. In this work, we investigated compositional and structural changes of Cs-sorbed weathered biotite (WB) before and after low-pressure sublimation with addition of NaCl-CaCl salts, to study Cs desorption mechanism from clay minerals. X-ray fluorescence spectroscopy clarified that 100% of Cs was removed with the salts at 700 
C. Moreover, we found that 99% of K in WB was removed as well with the salts. On the other hand, Ca increased with heating temperature. X-ray diffraction analysis clarified that the reflections from WB disappeared and a number of new reflections appeared after the treatment with the salts. These results indicate WB changed to some silicates, and we clarified that the dominant silicate was augite using transmission electron microscopy. Based on these results, we propose a new idea, Cs-free mineralization, for Cs removal from clay minerals utilizing the mechanism in which monovalent large cations are discharged with accompanying phase transition from clay minerals to other minerals.
Tc from 
Mo for commercial productionShiina, Takayuki*; Tsuchiya, Kunihiko; Nagai, Yasuki; Morikawa, Yasumasa*; Takeuchi, Nobuhiro*
no journal, ,
According to statistical data reported by the Japan Radioisotope Association (JRIA) in 2014, the Mo/Tc generator and Tc injections (Tc labeled pharmaceuticals) continues to account for approximately 80% of the entire in-vivo supply in Japan. Furthermore, the number of Tc injection supplies is approximately four times larger than that of the Mo/Tc generator. Therefore, Chiyoda Technol Co. have performed a research and development (R&D) for the domestic production of Tc in cooperation with the Japan Atomic Energy Agency (JAEA) and FUJIFILM RI pharma Co., Ltd. to ensure a constant and reliable supply of Tc. CTC therefore has a plan to stably produce Tc from Mo, which can be produced by the 
Mo(n,
) reaction using the Japan Materials Testing Reactor (JMTR) and by the 
Mo(n,2n) reaction using some new cyclotrons, and thereby to meet the Japanese demand for Tc together with pharmaceutical companies in Japan. These production methods of Mo were selected from viewpoints of safety, nuclear proliferation resistance and waste management. The specific activity of Mo produced by these methods, however, is very low compared with that of (n,f)Mo. Therefore, it is essential to develop some techniques for separation, concentration and recovery of Tc, and it will be necessary to choose the best methods such as a wet method by solvent extraction and a dry method by sublimation, finally. In future, we aim to provide to about 20% of the domestic demand for Mo using the JMTR and cyclotrons, 100-200 6-day Ci per week at the end of irradiation, and will carry out empirical studies for the commercial production of Tc.
